* Hering (1957a) and Robbins (1991a) report finds of Pegomya-larvae on this plant. The larvae have not been reared, and are not identified. Hering assumes that it concerns one of the species living on Rumex, that has tried to step over to Rheum. A photo by Rob Edmunds of such a mine demonstrates that these attempts are not succesfull: the mine remains corridor-like, and is therefore atypical.